Pairing type symmetry in cuprate superconductors

TL;DR

This paper reviews recent experimental evidence supporting d-wave pairing symmetry, particularly dx^2-y^2, in various cuprate high-temperature superconductors, highlighting advanced measurement techniques and their implications.

Contribution

It provides a comprehensive overview of recent experimental results confirming d-wave pairing symmetry in cuprates, including new phase-sensitive tests and high-precision measurements.

Findings

Evidence of d-type pairing symmetry from laser-based ARPES

Confirmation of dx^2-y^2 symmetry in parent cuprates

Identification of nonmonotonic gap functions in hole-doped systems

Abstract

We report a brief overview ofa number of results on a type of pairing state symmetry in cuprates HTSC from a current literature. The results of recent high-precision measurements of near-nodal d-type gap functions by a modern laser-based ARPES method or by a c-axis twisted Josephson junction for hole-doped Bi-2212 system are presented. Recent experimental evidence in favor of d-type pairing symmetry, with a special nonmonotonic functional form, for electron-doped cuprate NdCeCuO is discussed. A new essential results on the identification of dx^2-y^2 symmetry of superconducting order parameter for parent high-Tc cuprate structure, electron-doped infinite layer SrLaCuO system, by the phase sensitive tests is described. A complex of the data presented indicates a vital role of d-wave pairing symmetry, in the special dx^2-y^2 form for high-temperature conductivity in cuprate systems.